Book bag



FIG. 1 is a top and side perspective view of the book bag. The book pages are shown fanned open and in phantom. The book bag flaps are shown folded out;

FIG. 2 is a top perspective view of the book bag, with front and rear book bag book covers opened and with book bag flaps folded inbetween the book bag book covers and book pages;

FIG. 3 is a side perspective view of the book bag, with the front and rear book bag book covers closed and with book bag flaps folded out;

FIG. 4 is a front view of the book bag, with book bag flaps folded out, the rear view being the same;

FIG. 5 is a front view of the book bag, with book bag flaps folded in between the book bag book covers and book pages, the rear view being the same; and,

FIG. 6 is a side view of the book bag.

The book pages shown in broken lines in FIGS. 1–3 form no part of the claimed design. 

The ornamental design for a book bag, as shown and described. 